1 files changed, 49 insertions, 0 deletions
diff --git a/core/fxcrt/css/cfx_csstextbuf.cpp b/core/fxcrt/css/cfx_csstextbuf.cpp
new file mode 100644
index 0000000000..f2f3b94419
--- /dev/null
+++ b/core/fxcrt/css/cfx_csstextbuf.cpp
@@ -0,0 +1,49 @@
+// Copyright 2017 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#include "core/fxcrt/css/cfx_csstextbuf.h"
+
+#include "core/fxcrt/fx_memory.h"
+
+CFX_CSSTextBuf::CFX_CSSTextBuf()
+    : m_pBuffer(nullptr), m_iBufLen(0), m_iDatLen(0) {}
+
+CFX_CSSTextBuf::~CFX_CSSTextBuf() {
+  FX_Free(m_pBuffer);
+  m_pBuffer = nullptr;
+  m_iDatLen = m_iBufLen;
+}
+
+void CFX_CSSTextBuf::InitWithSize(int32_t iAllocSize) {
+  ExpandBuf(iAllocSize);
+}
+
+void CFX_CSSTextBuf::AppendChar(wchar_t wch) {
+  if (m_iDatLen >= m_iBufLen)
+    ExpandBuf(m_iBufLen * 2);
+
+  m_pBuffer[m_iDatLen++] = wch;
+}
+
+int32_t CFX_CSSTextBuf::TrimEnd() {
+  while (m_iDatLen > 0 && m_pBuffer[m_iDatLen - 1] <= ' ')
+    --m_iDatLen;
+  AppendChar(0);
+  return --m_iDatLen;
+}
+
+void CFX_CSSTextBuf::ExpandBuf(int32_t iDesiredSize) {
+  ASSERT(iDesiredSize > 0);
+  if (m_pBuffer && m_iBufLen == iDesiredSize)
+    return;
+
+  if (m_pBuffer)
+    m_pBuffer = FX_Realloc(wchar_t, m_pBuffer, iDesiredSize);
+  else
+    m_pBuffer = FX_Alloc(wchar_t, iDesiredSize);
+
+  m_iBufLen = iDesiredSize;
+}